\(9^{40}=\left(3^2\right)^{40}=3^{80}\)
\(27^{25}=\left(3^3\right)^{25}=3^{75}\)
Vì \(3^{80}>3^{75}\)nên \(27^{25}< 9^{40}\)
\(9^{40}=\left(3^2\right)^{40}=3^{80}\)
\(27^{25}=\left(3^3\right)^{25}=3^{75}\)
Vì \(3^{80}>3^{75}\Leftrightarrow9^{40}>27^{25}\)